Dynamic behavior of photosensitizers after multiphoton excitation

Details Dynamic behavior of photosensitizers after multiphoton excitation Dynamic behavior of photosensitizers after multiphoton excitation

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001spie.4262...41c&link_type=abstract

Proc. SPIE Vol. 4262, p. 41-47, Multiphoton Microscopy in the Biomedical Sciences, Ammasi Periasamy; Peter T. So; Eds.

Physics

1

Scientific paper

The spectroscopy and photochemistry of protoporphyrin IX (PpIX) in ethanol and in Triton X-100 micelle solution and Verteporfin in methanol and Triton X-100 micelle solution have been examined using nea infrared two-photon excitation (TPE). TPE will allow photodynamic therapy with highly localized light dosage. For PpIX, we have determined that the photochemistry subsequent to TPE is very similar to that found for one-photon excitation. Moreover, the photoproducts observed possess very intense two-photon excitation fluorescence spectra, which allows their detection at low relative concentrations. Verteporfin displays photodynamic behavior in methanol similar to that of PpIX in ethanol. However, in micelle solution Verteporfin exhibits photodynamic behavior indicative of two sensitizer populations, excimers and monomers. Photochemical models are presented.

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